[anonymouskimmer]

Humoral vaccines do provide some limited protection when it comes to transmission. Nothing like a mucosal vaccine would. But an additional line of protection for the susceptible we may come in contact with.

For full disclosure I don't vaccinate anymore (waiting until the mucosal vaccines are available). But I understand those who do, especially if they are around other people when maskless more than I am.

[oaktrout]

I was under the impression that there is no data showing that the covid mrna vaccines reduce transmission. If you are aware of a source that says otherwise I would love to check it out.

[anonymouskimmer]

I can't find the article I read a month or so ago that indicated a low protection of around 20% compared to vaccinated.

Here's a much older article about the original omicron (quite distinct from the BA.2 descendants we have now): https://www.cdc.gov/mmwr/volumes/71/wr/mm7109e1.htm

> The ARs among household contacts of index patients who had received a COVID-19 booster dose, of fully vaccinated index patients who completed their COVID-19 primary series within the previous 5 months, and of unvaccinated index patients were 42.7% (47 of 110), 43.6% (17 of 39), and 63.9% (69 of 108), respectively.

[oaktrout]

I appreciate the response. Hard to draw many conclusions from that study for a number of reasons, but perhaps the greatest in my mind is highlighted near the end: "TCOVID-19 prevention measures (vaccination, isolation, and mask use) are likely highly correlated within households, and the identified risk factors might not be independent predictors of transmission".

Basically this article doesn't show that vaccines prevent transmission. It doesn't show they don't either, although that there wasn't a more dramatic effect is a negative finding in my opinion. I wish the authors had analyzes the AR in vaccinated vs unvaccinated household contacts.